[libata] SCSI: clean up R/W recovery mode page

Clear ARRE, we don't do auto-reallocation on reads, just on writes.

Also, hardcode the size of the array using RW_RECOVERY_MPAGE_LEN,
following the style of the surrounding code.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --cc drivers/ata/libata-scsi.c
Simple merge